winter heliotrope

noun

a creeping perennial, Petasites fragrans, related to the butterbur, having lilac to heliotrope coloured flowers smelling of vanilla: found chiefly on road verges
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012